Been there, done that. "The Land Unknown" (1957), except it invokes volcanically-heated valleys. Otherwise, try the novel "Projekt Saucer III: Genesis" (1980) by W. A. Harbinson, which involves UFO-flying Nazis. Are you aware of the microbial life found in the deep under-ice Lake Vostok?
Been there, done that. "The Land Unknown" (1957), except it invokes volcanically-heated valleys. Otherwise, try the novel "Projekt Saucer III: Genesis" (1980) by W. A. Harbinson, which involves UFO-flying Nazis. Are you aware of the microbial life found in the deep under-ice Lake Vostok?
Yes, and there are chemosynthetic organisms that live in areas of deep ocean volcanic vents.